EP0659454B1 - Ski mit profilierter Lauffläche - Google Patents

Ski mit profilierter Lauffläche Download PDF

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Publication number
EP0659454B1
EP0659454B1 EP94116598A EP94116598A EP0659454B1 EP 0659454 B1 EP0659454 B1 EP 0659454B1 EP 94116598 A EP94116598 A EP 94116598A EP 94116598 A EP94116598 A EP 94116598A EP 0659454 B1 EP0659454 B1 EP 0659454B1
Authority
EP
European Patent Office
Prior art keywords
ski
width
rear portion
line
rtm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94116598A
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English (en)
French (fr)
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EP0659454A1 (de
Inventor
Bertrand Krafft
Gilles Silva
Jacques Le Masson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salomon SAS
Original Assignee
Salomon SAS
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Filing date
Publication date
Application filed by Salomon SAS filed Critical Salomon SAS
Publication of EP0659454A1 publication Critical patent/EP0659454A1/de
Application granted granted Critical
Publication of EP0659454B1 publication Critical patent/EP0659454B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/044—Structure of the surface thereof of the running sole

Definitions

  • the invention relates to a ski for evolution on snow, such as an alpine ski, a monoski or a snowboard.
  • It relates more particularly to a ski provided with a lower sole trimmed with ridges whose sliding ability has been improved.
  • the sliding surface is provided with discontinuous ridges oriented in the longitudinal direction, the shape of which is wavy, of generally sinuosoidal appearance, so as to preferentially give the sole a roughness coefficient Ra within an appropriate value range.
  • Document DE 40 22 286 relates to a sliding surface coating for which polyethylenes of different characteristics are provided; polyethylenes having a higher hardness in the basic surface pressure section.
  • This solution is expensive because it requires the use of different materials for the same sole.
  • the structuring wears out more quickly in the area where the polyethylene has a lower hardness; that is to say at the back of the ski. The benefit of differentiated roughness is quickly lost.
  • the object of the present invention is to provide a satisfactory solution to these problems.
  • Snow is a three-phase powdery medium, a mixture of ice, water and water vapor.
  • the proportion of each phase in the mixture varies progressively during the passage of the bearing surface of the ski due to two important parameters which are the friction caused at the sole / snow interface and the pressure distribution on the ski.
  • Figure 1 shows a ski on snow when it supports the weight of the skier and Figure 2 illustrates the shape of the pressure distribution curve (P) over the length of the ski (L).
  • the ski according to the invention comprises a lower sliding surface of plastic material, provided with a plurality of discontinuous ridges; said surface resting on a front contact line and a rear contact line when the ski is unloaded and is characterized in that the surface comprises an unstructured or weakly structured front part and a more highly structured rear part whose measured value of roughness parameter Rtm is greater than that measured in the front part; said rear part extending towards the rear of the ski in the direction of the rear contact line, from a transverse line situated between the mid-boot line of the ski and at the most distant a transverse line situated at a distance from the line of middle of shoe equal to 0.4 times the distance separating said line from the front contact line.
  • the parameter Rtm designates the average of the maximum roughnesses which measure the vertical difference between the highest point and the lowest point of the roughness profile over the total evaluation length, according to DIN 4762 / 1E or ISO 4287 / 1.
  • the value Rtm is less than or equal to 15 ⁇ m in the front part of the sliding surface and is greater than 15 ⁇ m in the rear part of the sliding surface.
  • the rear part of the highly structured sliding surface extends rearward, at least, to the rear contact line of said surface.
  • the Applicant has noticed an improvement in performance due most certainly to better rupture and better evacuation of the water film.
  • the rear part subjected to a strongly marked structuring begins from a line situated at a distance from the midline of the shoe of between 0.2 and 0.4 times the distance separating the midline from front contact line shoe.
  • the start of the highly structured part thus begins in a zone of high pressure which generally corresponds to a peak of maximum pressure situated in the vicinity of the stop before fixing.
  • the rear part comprises a marked structure such that the roughness value Rtm is greater than 15 ⁇ m on a central part of width (l1) only of the width (L) of the sole; said rear part comprising on either side of said structured central part, edges of width (l2) smooth or slightly structured and whose measured value of roughness Rtm is less than 15 ⁇ m and the measured value of roughness Rku ⁇ 3.
  • the central part plays an important role in the flat sliding of the ski and that it is therefore important that it is well structured in order to allow good flow and avoid the phenomenon of suction.
  • the ski is inclined by the skier on one or the other side edge.
  • the sole therefore remains in contact with the snow over a narrow lateral region bordering the central part.
  • the pressure exerted by the weight of the skier on this small surface is therefore large and it is therefore important to reduce friction as much as possible by providing a smooth surface or with less marked structure. It is necessary, in fact, to favor the support and hooking properties of the edges while reducing the "guiding" effects due to the structure of the sole which can oppose cornering.
  • the water film problem is secondary in this case.
  • the Rku (Roughness Kurtosis) parameter designates the flattening parameter of the height distribution density. The flatter the density curve, the larger Rku; on the contrary, if the curve is sharp and its maximum well centered, Rku is low (Standard ISO 4287/1).
  • the width (l2) of the edges is between 0.03 L and 0.3 L; knowing that the width (l1) of the central part of flat gliding must remain greater than or equal to 0.45 L.
  • the strongly striated rear part is of constant width along the lower surface of the ski.
  • Such a structure can thus be easily obtained by a repetitive and reproducible technique using the passage over the sole of a hot tool of constant edge width, in a single pass.
  • the structuring of the rear part is carried out by the hot and pressurized passage of a tool, on the lower sliding surface; said tool having the shape of a roller comprising a relief pattern with constant width of edges on the surface of which a plurality of discontinuous ribs is formed.
  • the highly structured rear part comprises a plurality of short, rectilinear and discontinuous streaks, arranged in separate or nested rows.
  • a majority, at least, of the ridges are oriented along the longitudinal axis of the ski. Some may however be inclined and have a certain angle with respect to the longitudinal axis, in particular in order to avoid an excessive 'rail' effect or else to improve the release of the water film under certain snow conditions or for certain types of skis.
  • the structure, of the rear part at least, has a roughness gradient such that the value Rtm and Rku decreases progressively, from the rear contact line in the direction of the front contact line.
  • the structuring may have a roughness gradient such that the values of Rtm and Rku gradually increase from the side edges towards the longitudinal axis over a significant part, at least, of the width of the lower surface, it being understood that the roughness (Rtm and Rku) can remain substantially constant over small portions.
  • the sliding surface is constituted by a coating of the same chemical nature and of the same hardness over the entire length of the ski.
  • this is a slightly arched alpine ski and the gliding sole or lower surface (1) rests on a front contact line (10) and a rear contact line ( 11).
  • the surface between these two lines (10, 11) meets the snow and becomes the bearing surface of the ski ( Figure 1).
  • the ski comprises a raised part in tip (2) and in heel (3).
  • the sole (1) preferably of polyethylene of width (L); bordered on each side by the metal side edges (4).
  • the sole includes a slightly striated front part (5) and a strongly striated rear part (6).
  • the rear part (6) is delimited, on the one hand, by the rear contact line (11) and on the other hand, by a line (12) located at a distance (d), in front of the virtual line ( 13) representing the position of the middle of the shoe indicated by the manufacturer.
  • the distance (d) may not exceed 0.4 times the distance (D) separating the mid-shoe line (13) from the front contact line (10).
  • the front part (5) is adjacent to the rear part (6) and extends in front of the latter, from the line (12) to the front contact line (10).
  • FIG. 4a shows in enlarged view, an example of structuring according to the invention. It can be a multitude of short, straight, discontinuous streaks (60) arranged in rows nested one inside the other.
  • the structure is more superficial and the ridges (50) are more spaced, shorter, less deep and less wide than those of the rear part ( Figure 4a).
  • the structure could also be almost non-existent and the surface as smooth as possible in this part:
  • FIG. 5 illustrates a variant of the invention in which the rear part (6) comprises a central zone (600) of width (11) which is highly structured and, on either side of said zone, lateral edges (61, 62) wide (l2), smooth or poorly structured.
  • the central zone (600) is of constant width (11) over the entire length of the rear part (6).
  • the lateral edges (61, 62) constitute the sliding surfaces in the curve of the ski where great pressure is exerted. Too much structuring in these areas would risk playing against the pivoting properties of the ski.
  • the width (l2) of each edge (61, 62) is between 0.03 L and 0.3 L. In any case, the width (l1) of the central zone is always greater than or equal to 0.45 x L.
  • FIGS. 6 and 7 illustrate an advantageous example allowing the structuring of the sole of a ski according to the invention and more particularly in the case where it is desired to obtain a constant width (l1) of the central zone (600) of the lower surface giving a variable width (12) of the lateral edges (61, 62).
  • a device comprising a heated tool (8) in the form of a roller and which has on its surface an embossed pattern with constant width (l) of edges, comprising a plurality of discontinuous ribs (80).
  • the surface of the roller is applied, under pressure, against the surface of the sole (1) of the ski to be prepared, by making the ski run longitudinally between several skids of guide (9).
  • pressure and temperature conditions are adapted without particular difficulties, in order to obtain satisfactory and reproducible results.
  • a HDPE type sole and in the case of the production of ridges according to the characteristics given above by way of example, it is preferable to work at a temperature of between 80 and 120 ° C., and apply pressure to the surface of the sole by the rotating tool (8).
  • the structure has a roughness gradient such that the measured parameters Rtm and Rku decrease progressively, from the rear contact line (11) in the direction of the front contact line (10).
  • This gradient can be obtained for example by gradually decreasing the number of streaks and their dimension (length, width and depth), from the rear line (11) to the front line (10).
  • the values Rtm and Rku can be substantially constant.
  • the increasing progression of the values Rtm and Rku takes place in stages, that is to say by a series of adjacent short portions in which the values Rtm and Rku are substantially constant but vary by a portion adjacent to each other.
  • the length of the ridges can vary, in general, between 4 mm and 50 mm depending on the type of snow and the type of ski used.
  • the coating used to constitute the ski sole is chosen from sintered or extruded polyethylenes.
  • the polyethylene may contain a more or less significant graphite filler (generally around 15% approximately).
  • a single material makes it possible to constitute the sole of the ski.

Claims (13)

  1. Ski zur Fortbewegung auf Schnee, der eine untere Gleitoberfläche (1) aus einem Kunststoffmaterial aufweist, die mit einer Vielzahl von diskontinuierlichen Riefen (50, 60) versehen ist, wobei die Oberfläche auf einer vorderen Kontaktlinie (10) und einer hinteren Kontaktlinie (11) ruht, wenn der Ski nicht belastet ist,
    dadurch gekennzeichnet, daß
    die Oberfläche (1) einen vorderen Teil (5) aufweist, der glatt oder schwach strukturiert ist, und einen hinteren Teil (6), der stark strukturiert ist und dessen gemessener Wert des Rauhigkeitsparameters Rtm größer als der in dem vorderen Teil gemessene ist, wobei sich der hintere Teil (6) in Richtung nach hinten des Ski in Richtung der hinteren Kontaktlinie (11) ausgehend von einer transversalen Linie (12) erstreckt, die sich zwischen der Mittellinie des Schuhes (13) und einer transversalen Linie befindet, die sich in einem Abstand (d) von der Mittellinie des Schuhes (13) befindet, der gleich 0,4 mal dem Abstand (D) ist, der die Linie (13) von der vorderen Kontaktlinie (10) trennt.
  2. Ski gemäß Anspruch 1, dadurch gekennzeichnet, daß der gemessene Wert Rtm kleiner oder gleich 15 µm in dem vorderen Teil (5) ist und größer als 15 µm in dem hinteren Teil (6) der Gleitoberfläche (1) ist.
  3. Ski gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß der hintere Teil (6) der Gleitoberfläche (1), der stark strukturiert ist, sich in Richtung nach hinten zumindest bis zu der hinteren Kontaktlinie (11) der Oberfläche erstreckt.
  4. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der hintere Teil (6), der der stark markierten Strukturierung unterworfen ist, ausgehend von einer Linie (12) beginnt, die sich in einem Abstand (d) befindet, der zwischen 0,2 und 0,4 mal dem Abstand (D) beträgt, der die Mittellinie des Schuhs (13) von der vorderen Kontaktlinie (10) trennt.
  5. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der hintere Teil (6) eine derartige Strukturierung aufweist, daß der Rauhigkeitswert Rtm größer als 15 µm über einen zentralen Bereich (6) mit einer Breite (l1) von nur der Breite (l2) der unteren Oberfläche (1) ist, wobei der hintere Teil beidseitig des zentralen Bereiches (600) Ränder (61, 62) aufweist, die eine glatte und wenig strukturierte Breite (12) haben und deren gemessener Rauhigkeitswert Rtm kleiner als 15 µm und deren Rauhigkeitswert Rku < 3 ist.
  6. Ski gemäß Anspruch 5, dadurch gekennzeichnet, daß die Breite (l2) der Ränder (61, 62) zwischen 0,03 L und 0,3 L beträgt, wobei die Breite (l1) des zentralen Bereiches (60) größer oder gleich 0,45 L ist.
  7. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der hintere Teil (6) eine konstante Breite (l1) längs der unteren Oberfläche (1) aufweist.
  8. Ski gemaß Anspruch 7, dadurch gekennzeichnet, daß die Strukturierung des hinteren Teiles (6) durch den Übergang bei Erwärmung und unter Druck eines Werkzeuges (8) über die untere Oberfläche (1) realisiert ist, wobei das Werkzeug (8) die Form einer Rolle aufweist, die ein Reliefmotiv mit einer konstanten Breite (1) der Ränder aufweist, über deren Oberfläche eine Vielzahl von diskontinuierlichen Rippen (80) geformt ist.
  9. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der hintere Teil (6), der stark strukturiert ist, eine Vielzahl von kurzen, geradlinigen und diskontinuierlichen Riefen (60) aufweist, die in getrennten oder versetzten Reihen angeordnet sind.
  10. Ski gemäß Anspruch 9, dadurch gekennzeichnet, daß zumindest eine Mehrzahl von Riefen (60) gemäß der longitudinalen Achse des Ski orientiert sind.
  11. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Strukturierung des hinteren Teiles (6) zumindest einen Rauhigkeitsgradienten aufweist, der derart ist, daß der gemessene Wert Rtm und der gemessene Wert Rku sich progressiv ausgehend von der hinteren Kontaktlinie (11) in Richtung der vorderen Kontaktlinie (10) verringern.
  12. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Strukturierung des hinteren Teiles (6) einen Rauhigkeitsgradienten über die Breite (L) der unteren Oberfläche aufweist, der derart ist, daß die gemessenen Werte von Rtm und Rku progressiv ausgehend von den seitlichen Kantenleisten (4) in Richtung der longitudinalen Achse über zumindest einen signifikanten Teil der Breite der unteren Oberfläche zunehmen, wobei die Rauhigkeit (Rtm, Rku) im wesentlichen konstant über kleine Abschnitte der Breite bleiben kann.
  13. Ski gemäß irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Gleitoberfläche (1) durch einen Überzug von gleicher chemischer Art und gleicher Härte über die gesamte Länge des Ski gebildet ist.
EP94116598A 1993-12-09 1994-10-21 Ski mit profilierter Lauffläche Expired - Lifetime EP0659454B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9315019 1993-12-09
FR9315019A FR2713498B1 (fr) 1993-12-09 1993-12-09 Ski comprenant une semelle structurée en fonction de la distribution de pression sur ledit ski.

Publications (2)

Publication Number Publication Date
EP0659454A1 EP0659454A1 (de) 1995-06-28
EP0659454B1 true EP0659454B1 (de) 1997-08-13

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ID=9453921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116598A Expired - Lifetime EP0659454B1 (de) 1993-12-09 1994-10-21 Ski mit profilierter Lauffläche

Country Status (6)

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US (1) US5725237A (de)
EP (1) EP0659454B1 (de)
JP (1) JPH07194760A (de)
AT (1) ATE156718T1 (de)
DE (1) DE69404961T2 (de)
FR (1) FR2713498B1 (de)

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Publication number Priority date Publication date Assignee Title
FR2800622B1 (fr) * 1999-11-05 2002-02-08 Salomon Sa Planche de glisse destinee a la pratique du surf sur neige
US6588772B2 (en) 2000-12-28 2003-07-08 The Burton Corporation Sintered sheet plastic material and gliding board base material
US7077418B2 (en) * 2001-07-10 2006-07-18 Fischer Gesellschaft M.B.H. Light-weight construction core and a method for producing the same
AT500159B8 (de) * 2001-10-01 2007-02-15 Atomic Austria Gmbh Schi, sprungschi oder snowboard mit einer strukturierten oberfläche
AT502101B1 (de) * 2005-07-14 2007-09-15 Atomic Austria Gmbh Verfahren zur bearbeitung von laufflächen von wintersportgeräten sowie wintersportgerät und vorrichtung zur herstellung von belägen
AT502718B1 (de) * 2006-03-23 2007-05-15 Fischer Gmbh Ski
US20070257469A1 (en) * 2006-05-05 2007-11-08 Burns David J Vertically and horizontally loading trailer latching assembly
US20080111346A1 (en) * 2006-11-01 2008-05-15 Burns David J Fifth wheel hitch cart assembly
US7669879B2 (en) * 2007-03-05 2010-03-02 Dykema Robert A Skateboard deck and method of making same
US20100044997A1 (en) * 2007-11-01 2010-02-25 Burns David J Fifth wheel hitch cart assembly
FR2926735B1 (fr) * 2008-01-25 2010-03-26 Salomon Sa Ski alpin avec moyens de reglage
AT514124A1 (de) * 2013-03-22 2014-10-15 Fischer Sports Gmbh Aufstiegshilfe für einen Ski sowie Verfahren zur Herstellung
AT514968B1 (de) * 2013-10-22 2017-11-15 Fischer Sports Gmbh Lauffläche für einen Ski
CA3026519A1 (en) * 2016-06-10 2017-12-14 Fujimi Incorporated Sliding instrument and method for manufacturing same

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DE182997C (de) * 1906-08-16 1907-02-18
CH161592A (de) * 1931-12-31 1933-05-15 Wolfinger Josef Ski und Verfahren zu seiner Herstellung.
DE961335C (de) * 1953-12-12 1957-04-04 Franz Kneissl Ski
FR1102116A (fr) * 1954-03-30 1955-10-17 Abel Rossignol Ets Ski
CH331559A (fr) * 1956-05-16 1958-07-31 Ray Gisele Ski
US3378274A (en) * 1966-03-17 1968-04-16 Brunswick Corp Surf-type snow ski
DE2623852A1 (de) * 1975-06-17 1976-12-23 Fischer Gmbh Ski
AT346742B (de) * 1976-02-13 1978-11-27 Kaestle Gmbh Schi
CA1099759A (en) * 1976-03-12 1981-04-21 Hermann Schnurrenberger Ski
US4359077A (en) * 1978-07-20 1982-11-16 Fischer Gesellschaft M.B.H. Process and apparatus for forming a profiled tread surface on a ski
US4268059A (en) * 1978-07-20 1981-05-19 Fischer Gesellschaft M.B.H. Process and apparatus for forming a profiled tread surface on a ski
US4406478A (en) * 1978-07-20 1983-09-27 Fischer Gesellschaft M.B.H. Process and apparatus for forming a profiled tread surface on a ski
US4223909A (en) * 1979-03-01 1980-09-23 Trak Incorporated Ski with improved three-dimensional running surface
AT382319B (de) * 1984-10-09 1987-02-10 Trak Inc Kunststoff-laufflaechenbelag fuer skier
AT383744B (de) * 1985-08-21 1987-08-10 Kaestle Gmbh Langlaufski
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AT398169B (de) * 1989-08-18 1994-10-25 Fischer Gmbh Laufflächenbelag für skier
AT398038B (de) * 1989-11-02 1994-08-25 Fischer Gmbh Ski
FR2683730B1 (fr) * 1991-11-19 1995-03-31 Rossignol Sa Ski, ou autre engin ou planche de glisse sur neige, a semelle striee.

Also Published As

Publication number Publication date
FR2713498B1 (fr) 1996-01-19
JPH07194760A (ja) 1995-08-01
DE69404961D1 (de) 1997-09-18
FR2713498A1 (fr) 1995-06-16
ATE156718T1 (de) 1997-08-15
EP0659454A1 (de) 1995-06-28
DE69404961T2 (de) 1998-03-19
US5725237A (en) 1998-03-10

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